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Appendix C Technical data for the 7951
Page C.12
C.6 Earthing
In addition to earthing the chassis, (described in chapter 4), you may have to make extra earth connections in
some cases, depending on the installation requirements.
The types of connection can be split into three groups, each of which has different earthing requirements. The
groups are:
Group 1 (non-isolated power supply): Serial communications ports.
Pulse outputs.
Status outputs.
Group 2 (isolated power supply): Status inputs.
Group 3 (isolated power supply): Analogue inputs.
Frequency inputs.
Analogue outputs.
The diagrams on the next two pages shows you how to earth the external connections.